description: An extension to replicate the changes within R5 allowing the data type of Specimen.collection.bodySite to act as a CodeableReference (BodyStructure).
package_name: fhir.r4.ukcore.stu2
derivation: constraint
name: ExtensionUKCoreBodySiteReference
type: Extension
elements:
  url:
    pattern: {type: uri, value: 'https://fhir.hl7.org.uk/StructureDefinition/Extension-UKCore-BodySiteReference'}
    type: uri
    index: 0
  value:
    short: Reference to BodyStructure
    choices: [valueReference]
    index: 2
  valueReference:
    type: Reference
    short: Reference to BodyStructure
    choiceOf: value
    refers: ['http://hl7.org/fhir/StructureDefinition/BodyStructure']
    index: 3
package_version: 2.0.2
class: extension
kind: complex-type
url: https://fhir.hl7.org.uk/StructureDefinition/Extension-UKCore-BodySiteReference
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 1.0.0
required: [value, valueReference]